Coil component

Abstract

To provide a coil component that improves coil characteristics such as filter characteristics by reducing the difference in coil length in a double coil.SOLUTION: In a coil component 10, first distance D1 at an end face 12a of a main body is longer than second distance D2 at an end face 12b, thereby reducing the difference in coil length between a first coil portion and a second coil portion, thereby achieving high coil characteristics. For example, when the coil component 10 is used as a common mode filter, high filter characteristics are achieved because the difference between the coil length of the first coil portion C1 and the coil length of the second coil portion C2 is reduced (or the coil lengths are the same).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a coil component. [Background technology]

[0002] Patent Document 1 listed below discloses a coil component in which a double coil is formed by a pair of coil patterns provided on one side of a substrate and a pair of coil patterns provided on the other side of the substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-92444 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have conducted extensive research into the coil length of double coils and have discovered a new technique that can improve coil characteristics such as filter characteristics by reducing the difference in coil length.

[0005] An object of the present invention is to provide a coil component in which the coil characteristics of a double coil are improved. [Means for solving the problem]

[0006] A coil component according to one aspect of the present invention includes an element body having first and second end faces that are parallel to each other; an insulating substrate provided within the element body, perpendicular to the first and second end faces, and extending between the first and second end faces; a first planar coil pattern provided on one side of the insulating substrate, wound around a magnetic core perpendicular to the insulating substrate, and having an inner end and an outer end that extends to the first end face of the element body; and a second planar coil pattern provided on the other side of the insulating substrate, having an inner end that overlaps the inner end of the first planar coil pattern when viewed in the thickness direction of the insulating substrate and an outer end that overlaps the inner end of the first planar coil pattern when viewed in the thickness direction of the insulating substrate. a first coil portion having a first through conductor penetrating the insulating substrate in the thickness direction and connecting an inner end of the first planar coil pattern to an inner end of the second planar coil pattern; a third planar coil pattern provided on one surface of the insulating substrate so as to be wound in parallel with the first planar coil pattern and having an inner end and an outer end extending to a second end surface of the element body; and a third planar coil pattern provided on the other surface of the insulating substrate and having an inner end overlapping the inner end of the third planar coil pattern as seen in the thickness direction of the insulating substrate and an outer end extending to a second end surface of the element body. a second coil section having a fourth planar coil pattern having an outer end portion extending to the first end surface of the element body, a second through conductor penetrating the insulating substrate in the thickness direction and connecting an inner end portion of the third planar coil pattern to an inner end portion of the fourth planar coil pattern, a first external terminal electrode provided on the first end surface of the element body and connected to the outer end portion of the first planar coil pattern, a second external terminal electrode provided on the first end surface of the element body and connected to the outer end portion of the first planar coil pattern, a third external terminal electrode provided on the second end surface of the element body and connected to the outer end portion of the third planar coil pattern, and a fourth external terminal electrode provided on the second end face of the element body and connected to an outer end of the fourth planar coil pattern, wherein the outer end of the first planar coil pattern exposed on the first end face and the outer end of the third planar coil pattern exposed on the second end face face each other in the facing direction between the first end face and the second end face, and the outer end of the second planar coil pattern exposed on the first end face and the outer end of the fourth planar coil pattern exposed on the second end face face each other in the facing direction between the first end face and the second end face, and in a direction parallel to the insulating substrate,A first distance between a connection point on the first end face between an outer end of the first planar coil pattern and the first external terminal electrode and a connection point on the second end face between an outer end of the second planar coil pattern and the third external terminal electrode is different from a second distance between a connection point on the second end face between an outer end of the third planar coil pattern and the third external terminal electrode and a connection point on the second end face between an outer end of the fourth planar coil pattern and the fourth external terminal electrode.

[0007] In the above coil component, the first distance at the first end face and the second distance at the second end face are different, thereby reducing the difference between the coil length of the first coil portion and the coil length of the second coil portion, thereby achieving high coil characteristics. [Effects of the Invention]

[0008] According to the present invention, a coil component is provided in which the coil characteristics of a double coil are improved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view of a coil component according to an embodiment. [Figure 2] FIG. 2 is an exploded view of the coil component shown in FIG. [Figure 3] 3 is a cross-sectional view of the coil device shown in FIG. 1 taken along line III-III. [Figure 4] FIG. 4 is a plan view showing a planar coil pattern provided on the upper surface of the substrate. [Figure 5] FIG. 5 is a perspective view showing a planar coil pattern provided on the lower surface of the substrate. [Figure 6] 6(a) and 6(b) are diagrams showing the end faces of the element body shown in FIG. [Figure 7] FIG. 7 is an exploded view of a coil component having a different configuration. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same elements or elements having the same functions will be denoted by the same reference numerals, and redundant description will be omitted.

[0011] The structure of a coil component 10 according to the embodiment will be described with reference to FIGS.

[0012] The coil device 10 is composed of a main body 12 (element body) having a rectangular parallelepiped shape, and two pairs of external terminal electrodes 14A, 14B, 14C, and 14D provided on the surface of the main body 12. The two pairs of external terminal electrodes 14A, 14B, 14C, and 14D are provided in pairs on parallel end faces 12a and 12b of the main body 12. The coil device 10 is designed, for example, to have dimensions of long sides of 2.5 mm, short sides of 2.0 mm, and a height of 0.8 to 1.0 mm.

[0013] For ease of explanation, the XYZ coordinate system will be set as shown in the figure below. That is, the thickness direction of the main body 12 is set as the Z direction, the facing direction of the end faces 12a and 12b on which the external terminal electrodes are provided is set as the X direction, and the direction perpendicular to the Z direction and the X direction is set as the Y direction. In this case, when viewed from the Z direction, the main body 12 has a rectangular shape, and the end faces 12a and 12b correspond to a pair of short sides of the rectangle.

[0014] 2, the main body 12 includes an insulating substrate 20, a coil C provided on the insulating substrate 20, and a magnetic body 30. A magnetic core Z1 of the coil C is perpendicular to the insulating substrate 20 and extends along the Z direction.

[0015] The insulating substrate 20 is a rectangular plate-like member provided inside the main body 12 and is made of a non-magnetic insulating material. The insulating substrate 20 extends between the end faces 12a and 12b and is designed to be perpendicular to the end faces 12a and 12b. An elliptical through-hole 20c is provided in the center of the insulating substrate 20. The insulating substrate 20 may be a substrate made of glass cloth impregnated with epoxy resin and having a thickness of 10 μm to 60 μm. In addition to epoxy resin, BT resin, polyimide, aramid, etc. may also be used. Ceramic or glass may also be used as the material for the insulating substrate 20. Mass-produced printed circuit board materials are preferred as the material for the insulating substrate 20, and resin materials used for BT printed circuit boards, FR4 printed circuit boards, or FR5 printed circuit boards are particularly preferred.

[0016] The coil C includes a first coil portion C1 and a second coil portion C2 that form a double coil structure. The first coil portion C1 includes a first planar coil pattern 22A having a planar spiral shape and provided on the upper surface 20a (one side) of the insulating substrate 20, a second planar coil pattern 22B having a planar spiral shape and provided on the lower surface 20b (the other side) of the insulating substrate 20, and a first through conductor 26 that connects the first planar coil pattern 22A and the second planar coil pattern 22B. The second coil portion C2 includes a third planar coil pattern 22C having a planar spiral shape and provided on the upper surface 20a of the insulating substrate, a fourth planar coil pattern 22D having a planar spiral shape and provided on the lower surface 20b of the insulating substrate 20, and a second through conductor 27 that connects the third planar coil pattern 22C and the fourth planar coil pattern 22D.

[0017] The first planar coil pattern 22A of the first coil portion C1 and the third planar coil pattern 22C of the second coil portion C2 are wound adjacent to each other in parallel on the upper surface 20a of the insulating substrate 20. Furthermore, the second planar coil pattern 22B of the first coil portion C1 and the fourth planar coil pattern 22D of the second coil portion C2 are wound adjacent to each other in parallel on the lower surface 20b of the insulating substrate 20.

[0018] 3, each of the planar coil patterns 22A, 22B, 22C, and 22D has a rectangular cross section and is designed to have the same height from the insulating substrate 20. Each of the through conductors 26 and 27 is provided so as to penetrate the insulating substrate 20 in the thickness direction, and has, for example, a substantially cylindrical or substantially rectangular columnar shape. Each of the through conductors 26 and 27 may be formed from a hole provided in the insulating substrate 20 and a conductive material (for example, a metal material such as Cu) filled in the hole.

[0019] A resin wall 24 is provided between the first planar coil pattern 22A and the third planar coil pattern 22C, which are wound in parallel on the upper surface 20a of the insulating substrate, and the first planar coil pattern 22A and the third planar coil pattern 22C are physically and electrically separated by each resin wall 24. Resin walls 24 are also provided on the outside of the outermost turn and the inside of the innermost turn of the first planar coil pattern 22A and the third planar coil pattern 22C. In this embodiment, the resin walls 24 located on the outside of the outermost turn and the inside of the innermost turn are designed to be thicker than the resin walls 24 located between the first planar coil pattern 22A and the third planar coil pattern 22C.

[0020] Resin walls 24 are also provided between the second planar coil pattern 22B and the fourth planar coil pattern 22D, which are wound in parallel on the lower surface 20b of the insulating substrate, and the second planar coil pattern 22B and the fourth planar coil pattern 22D are physically and electrically separated by each resin wall 24. Resin walls 24 are also provided on the outside of the outermost turn and the inside of the innermost turn of the second planar coil pattern 22B and the fourth planar coil pattern 22D. In this embodiment, the resin walls 24 located on the outside of the outermost turn and the inside of the innermost turn are designed to be thicker than the resin walls 24 located between the second planar coil pattern 22B and the fourth planar coil pattern 22D.

[0021] The resin walls 24 are made of an insulating resin material. The resin walls 24 can be provided on the insulating substrate 20 before the planar coil patterns 22A, 22B, 22C, and 22D are formed. In this case, the planar coil patterns 22A, 22B, 22C, and 22D are plated and grown between the walls defined by the resin walls 24. That is, the resin walls 24 provided on the insulating substrate 20 define the formation areas of the planar coil patterns 22A, 22B, 22C, and 22D. The resin walls 24 can be provided on the insulating substrate 20 after the planar coil patterns 22A, 22B, 22C, and 22D are formed. In this case, the resin walls 24 are provided in the planar coil patterns 22A, 22B, 22C, and 22D by filling, coating, or the like.

[0022] The height of the resin wall 24 (i.e., the height with respect to the insulating substrate 20) is designed to be higher than the height of the planar coil patterns 22A, 22B, 22C, and 22D. Therefore, compared to when the height of the resin wall 24 and the height of the planar coil patterns 22A, 22B, 22C, and 22D are the same, the creepage distance between the adjacent planar coil patterns 22A, 22B, 22C, and 22D via the resin wall 24 is extended. This prevents short circuits from occurring between the adjacent planar coil patterns 22A, 22B, 22C, and 22D.

[0023] An insulating layer 25 is interposed between adjacent resin walls 24. The insulating layer 25 is provided over the entire upper surfaces of the planar coil patterns 22A, 22B, 22C, and 22D between adjacent resin walls 24. The insulating layer 25 is made of a resin such as an epoxy resin or a polyimide resin, and is formed using a photolithography method.

[0024] The magnetic body 30 integrally covers the insulating substrate 20 and the coil C. More specifically, the magnetic body 30 covers the insulating substrate 20 and the coil C from above and below, and also covers the outer peripheries of the insulating substrate 20 and the coil C. The magnetic body 30 also fills the inside of the through hole 20c of the insulating substrate 20 and the inner region of the coil C.

[0025] The magnetic body 30 is made of a resin containing a metal magnetic powder. The resin containing a metal magnetic powder is a binder powder in which metal magnetic powder is bound by a binder resin. The metal magnetic powder of the resin containing a metal magnetic powder constituting the magnetic body 30 is made of, for example, an iron-nickel alloy (permalloy alloy), carbonyl iron, an amorphous, non-crystalline, or crystalline FeSiCr-based alloy, sendust, or the like. The binder resin is, for example, a thermosetting epoxy resin. In this embodiment, the content of the metal magnetic powder in the binder powder is 80 to 92 vol% in volume percent and 95 to 99 wt% in mass percent. From the viewpoint of magnetic properties, the content of the metal magnetic powder in the binder powder may be 85 to 92 vol% in volume percent and 97 to 99 wt% in mass percent. The magnetic powder of the resin containing a metal magnetic powder constituting the magnetic body 30 may be a powder having one type of average particle size or a mixed powder having multiple types of average particle sizes. In this embodiment, the magnetic powder of the resin containing metal magnetic powder that constitutes the magnetic body 30 is a mixed powder having three different average particle sizes. When the magnetic powder of the resin containing metal magnetic powder that constitutes the magnetic body 30 is a mixed powder, the types of magnetic powders with different average particle sizes may be the same or different.

[0026] Two pairs of external terminal electrodes 14A, 14B, 14C, and 14D provided on end faces 12a and 12b of the main body 12 are connected to outer ends 22a of the corresponding planar coil patterns 22A, 22B, 22C, and 22D, respectively. That is, the first external terminal electrode 14A and the second external terminal electrode 14B provided on the end face 12a (first end face) are connected to the outer ends 22a of the first planar coil pattern 22A and the second planar coil pattern 22B, respectively, and the third external terminal electrode 14C and the fourth external terminal electrode 14D provided on the end face 12b (second end face) are connected to the outer ends 22a of the second planar coil pattern 22B and the fourth planar coil pattern 22D, respectively.

[0027] The first external terminal electrode 14A and the third external terminal electrode 14C face each other along the X direction, and the second external terminal electrode 14B and the fourth external terminal electrode 14D face each other along the X direction.

[0028] Next, the pattern shape of each of the planar coil patterns 22A, 22B, 22C, and 22D will be described in more detail with reference to Figures 4 and 5. Note that the dashed dotted line in Figures 4 and 5 indicates an equidistance line L that is equal in distance to the side surface 12e and the side surface 12f when viewed from the Z direction.

[0029] All four planar coil patterns 22A, 22B, 22C, and 22D are wound around a through hole 20c provided in the center of the insulating substrate 20. A magnetic core Z1 of the coil C penetrates the inside of the through hole 20c of the insulating substrate 20 and the magnetic body 30 that fills the inner region of the coil C.

[0030] Each of the planar coil patterns 22A, 22B, 22C, and 22D has an outer end 22a that reaches and is exposed at the end face 12a or end face 12b of the main body 12, an inner end 22b that is provided on the periphery of the through hole 20c, and a winding portion 22c that connects the outer end 22a and the inner end 22b.

[0031] The inner end 22b of the first planar coil pattern 22A is located on the equidistant line L around the periphery of the through hole 20c, and is located on the end surface 12a side of the through hole 20c when viewed from the Z direction. A first through conductor 26 extending in the Z direction is provided at a position overlapping with the inner end 22b of the first planar coil pattern 22A. That is, the first through conductor 26 is located on the equidistant line L. The first through conductor 26 is in contact with the first planar coil pattern 22A at its upper end surface and in contact with the second planar coil pattern 22B at its lower end surface.

[0032] The outer end 22a of the first planar coil pattern 22A extends to the end face 12a and is connected to the first external terminal electrode 14A at the end face 12a. When viewed from the Z direction, the outer end 22a of the first planar coil pattern 22A has a rectangular shape extending along the end face 12a. The outer end 22a of the first planar coil pattern 22A is located on the side face 12f side with respect to the equidistance line L.

[0033] The winding portion 22c of the first planar coil pattern 22A forms part of the innermost turn and part of the outermost turn of the planar coil patterns 22A and 22C provided on the upper surface 20a of the insulating substrate 20. The number of turns of the winding portion 22c of the first planar coil pattern 22A is approximately two turns.

[0034] The inner end 22b of the third planar coil pattern 22C is located on the equidistant line L around the periphery of the through hole 20c, and is located on the end face 12b side of the through hole 20c when viewed from the Z direction. In this embodiment, the inner end 22b of the first planar coil pattern 22A and the inner end 22b of the third planar coil pattern 22C are arranged on the equidistant line L to sandwich the magnetic core Z1 therebetween.

[0035] A second through conductor 27 extending in the Z direction is provided at a position overlapping the inner end portion 22b of the third planar coil pattern 22C. That is, the first through conductor 26 and the second through conductor 27 are arranged to sandwich the magnetic core Z1 on the equidistance line L. The second through conductor 27 is in contact with the third planar coil pattern 22C at its upper end surface and in contact with the fourth planar coil pattern 22D at its lower end surface.

[0036] The outer end 22a of the third planar coil pattern 22C extends to the end face 12b and is connected to the third external terminal electrode 14C at the end face 12b. When viewed from the Z direction, the outer end 22a of the third planar coil pattern 22C has a rectangular shape extending along the end face 12b. The outer end 22a of the third planar coil pattern 22C is located on the side face 12f side with respect to the equidistance line L. The outer end 22a of the third planar coil pattern 22C faces the outer end 22a of the first planar coil pattern 22A along the X direction.

[0037] The winding portion 22c of the third planar coil pattern 22C is wound adjacent to the winding portion 22c of the first planar coil pattern 22A. The number of turns of the winding portion 22c of the third planar coil pattern 22C is approximately the same as the number of turns of the winding portion 22c of the first planar coil pattern 22A, which is approximately 2 turns. The winding portion 22c of the third planar coil pattern 22C is wound so as to be sandwiched between the winding portions 22c of the first planar coil pattern 22A.

[0038] An inner end 22b of the second planar coil pattern 22B is located on the equidistance line L on the periphery of the through-hole 20c, and is located on the end surface 12a side of the through-hole 20c when viewed from the Z direction.

[0039] The outer end 22a of the second planar coil pattern 22B extends to reach the end face 12a and is connected to the second external terminal electrode 14B at the end face 12a. When viewed from the Z direction, the outer end 22a of the second planar coil pattern 22B has a rectangular shape extending along the end face 12a. The outer end 22a of the second planar coil pattern 22B is located on the side face 12e side with respect to the equidistance line L.

[0040] The winding portion 22c of the second planar coil pattern 22B forms part of the innermost turn and part of the outermost turn of the planar coil patterns 22B and 22D provided on the lower surface 20b of the insulating substrate 20. The number of turns of the winding portion 22c of the second planar coil pattern 22B is approximately 2 turns, similar to the number of turns of the winding portion 22c of the first planar coil pattern 22A.

[0041] The inner end 22b of the fourth planar coil pattern 22D is located on the equidistant line L around the periphery of the through hole 20c, and is located on the end face 12b side of the through hole 20c when viewed from the Z direction. In this embodiment, the inner end 22b of the second planar coil pattern 22B and the inner end 22b of the fourth planar coil pattern 22D are arranged on the equidistant line L to sandwich the magnetic core Z1 therebetween.

[0042] The outer end 22a of the fourth planar coil pattern 22D extends to reach the end face 12b and is connected to the fourth external terminal electrode 14D at the end face 12b. When viewed from the Z direction, the outer end 22a of the fourth planar coil pattern 22D has a rectangular shape extending along the end face 12b. The outer end 22a of the third planar coil pattern 22C is located on the side face 12e side with respect to the equidistance line L. The outer end 22a of the fourth planar coil pattern 22D faces the outer end 22a of the second planar coil pattern 22B in the X direction.

[0043] The winding portion 22c of the fourth planar coil pattern 22D is wound so as to be sandwiched between the winding portions 22c of the second planar coil pattern 22B. The number of turns of the winding portion 22c of the fourth planar coil pattern 22D is approximately the same as the number of turns of the winding portion 22c of the second planar coil pattern 22B, which is approximately 2 turns. The winding portion 22c of the fourth planar coil pattern 22D is wound so as to be sandwiched between the winding portions 22c of the second planar coil pattern 22B.

[0044] In this embodiment, four paired electrodes 40 are formed on the insulating substrate 20. Each paired electrode 40 overlaps the outer end 22a of each of the four planar coil patterns 22A to 22D via the insulating substrate 20. The paired electrodes 40 and the outer end 22a are connected to each other by through conductors 41 provided in the insulating substrate 20. When viewed from the Z direction, each paired electrode 40 has the same shape (rectangular) as the outer end 22a. The outer end 22a of each of the four planar coil patterns 22A to 22D is duplicated by the four paired electrodes 40, respectively, thereby improving electrical connectivity with the external terminal electrodes 14A to 14D. Note that it is not necessary to duplicate the outer end 22a of all four planar coil patterns 22A to 22D; only the outer end 22a of some of the planar coil patterns 22A to 22D may be duplicated. When viewed from the Z direction, each paired electrode 40 may be shaped to completely or partially overlap the outer end 22a. The positions of the paired electrodes 40 in the direction parallel to the insulating substrate 20 (the left-right direction in FIG. 6) may be the same or shifted with respect to the outer ends 22a of the pair.

[0045] 6, in a direction parallel to the insulating substrate 20 (the left-right direction in FIG. 6), the shortest distance D1 (first distance) between a connection point P1 on the end face 12a between the outer end 22a of the first planar coil pattern 22A and the first external terminal electrode 14A and a connection point P2 between the outer end 22a of the second planar coil pattern 22B and the second external terminal electrode 14B is different from the shortest distance D2 (second distance) between a connection point P3 on the end face 12b between the outer end 22a of the third planar coil pattern 22C and the third external terminal electrode 14C and a connection point P4 between the outer end 22a of the fourth planar coil pattern 22D and the fourth external terminal electrode 14D. Specifically, the distance D2 is designed to be shorter than the distance D1 (D1>D2). In this case, the coil lengths of the third planar coil pattern 22C and the fourth planar coil pattern 22D drawn out to the end surface 12b are shortened near the end surface 12b of the main body 12. The closer a connection point P3 between the outer end portion 22a of the third planar coil pattern 22C and the third external terminal electrode 14C is to the equidistance line L, the shorter the coil length of the third planar coil pattern 22C. Similarly, the closer a connection point P4 between the outer end portion 22a of the fourth planar coil pattern 22D and the fourth external terminal electrode 14D is to the equidistance line L, the shorter the coil length of the fourth planar coil pattern 22D.

[0046] As in the above-described coil device 10, when the coil C is a dual coil composed of a first coil portion C1 and a second coil portion C2, and the outer end 22 a of the first planar coil pattern 22A faces the outer end 22 a of the third planar coil pattern 22C along the X direction, and the outer end 22 a of the second planar coil pattern 22B faces the outer end 22 a of the fourth planar coil pattern 22D along the X direction, the coil length of the first coil portion C1 can be longer than the coil length of the second coil portion C2. For example, when the coil device 10 is used as a common mode filter, the first external terminal electrode 14A connected to the first coil portion C1 and the third external terminal electrode 14C connected to the second coil portion C2 are used as input terminals, and the second external terminal electrode 14B connected to the first coil portion C1 and the fourth external terminal electrode 14D connected to the second coil portion C2 are used as output terminals. In this case, the difference between the coil length of the first coil portion C1 and the coil length of the second coil portion C2 affects coil characteristics such as filter characteristics.

[0047] When the first external terminal electrode 14A and the second external terminal electrode 14B connected to the first coil portion C1 are provided on the same element surface (i.e., end surface 12a), and when the third external terminal electrode 14C and the fourth external terminal electrode 14D connected to the second coil portion C2 are provided on the same element surface (i.e., end surface 12b), short circuits at the end surfaces 12a and 12b can be suppressed. In particular, when the difference in voltage applied to the first coil portion C1 and the second coil portion C2 is relatively large, arranging the external terminal electrode connected to the first coil portion C1 and the external terminal electrode connected to the second coil portion C2 on the same surface may cause a short circuit between the external terminal electrodes; however, arranging the external terminal electrodes 14A, 14B connected to the first coil portion C1 on the same surface makes it less likely that a short circuit will occur between the external terminal electrodes 14A, 14B, and arranging the external terminal electrodes 14C, 14D connected to the second coil portion C2 on the same surface makes it less likely that a short circuit will occur between the external terminal electrodes 14C, 14D.

[0048] In the above-mentioned coil component 10, the first distance D1 at the end face 12a of the main body portion 12 is longer than the second distance D2 at the end face 12b, thereby reducing the difference in coil length between the first coil portion C1 and the second coil portion C2 (or making them the same coil length), thereby achieving high coil characteristics.

[0049] The difference between the coil lengths of the first coil portion C1 and the second coil portion C2 can be adjusted not only in the case where the first distance D1 at the end face 12a of the main body 12 is longer than the second distance D2 at the end face 12b, but also in the case where the first distance D1 at the end face 12a of the main body 12 is shorter than the second distance D2 at the end face 12b. For example, a difference between the coil lengths of the first coil portion C1 and the second coil portion C2 may occur in areas other than the vicinity of the end faces 12a and 12b of the main body 12. For example, as shown in FIG. 7 , when the first coil portion C1 and the second coil portion C2 are wound such that the through conductors 26 and 27 are adjacent to each other as viewed in the Z direction, a difference between the coil lengths of the first coil portion C1 and the second coil portion C2 occurs in areas other than the vicinity of the end faces 12a and 12b of the main body 12. In such a case, by making the first distance D1 at the end face 12a of the main body portion 12 different from the second distance D2 at the end face 12b, the difference between the coil length of the first coil portion C1 and the coil length of the second coil portion C2 can be reduced (or made the coil lengths the same).

[0050] As can be understood from the above description, the present specification discloses the following. [Appendix 1] an element body having a first end face and a second end face parallel to each other; an insulating substrate provided within the element body, perpendicular to the first end face and the second end face, and extending between the first end face and the second end face; a first coil portion including: a first planar coil pattern provided on one surface of the insulating substrate, wound around a magnetic core perpendicular to the insulating substrate, and having an inner end and an outer end extending to the first end surface of the element body; a second planar coil pattern provided on the other surface of the insulating substrate, having an inner end overlapping the inner end of the first planar coil pattern when viewed in a thickness direction of the insulating substrate and an outer end extending to the first end surface of the element body; and a first through conductor penetrating the insulating substrate in the thickness direction and connecting the inner end of the first planar coil pattern to the inner end of the second planar coil pattern; a third planar coil pattern wound in parallel with the first planar coil pattern on the one surface of the insulating substrate, the third planar coil pattern having an inner end and an outer end extending to the second end surface of the element body; a fourth planar coil pattern formed on the other surface of the insulating substrate, the fourth planar coil pattern having an inner end overlapping the inner end of the third planar coil pattern when viewed in a thickness direction of the insulating substrate and an outer end extending to the second end surface of the element body; and a second through conductor penetrating the insulating substrate in a thickness direction and connecting the inner end of the third planar coil pattern to the inner end of the fourth planar coil pattern; a first external terminal electrode provided on the first end surface of the element body and connected to an outer end of the first planar coil pattern; a second external terminal electrode provided on the first end surface of the element body and connected to an outer end of the first planar coil pattern; a third external terminal electrode provided on the second end surface of the element body and connected to an outer end of the third planar coil pattern; and a fourth external terminal electrode provided on the second end surface of the element body and connected to an outer end of the fourth planar coil pattern. Equipped with an outer end of the first planar coil pattern exposed on the first end surface and an outer end of the third planar coil pattern exposed on the second end surface face each other in a facing direction between the first end surface and the second end surface, and an outer end of the second planar coil pattern exposed on the first end surface and an outer end of the fourth planar coil pattern exposed on the second end surface face each other in a facing direction between the first end surface and the second end surface; a first distance, in a direction parallel to the insulating substrate, between a connection point on the first end face between an outer end of the first planar coil pattern and the first external terminal electrode and a connection point on the second end face between an outer end of the second planar coil pattern and the second external terminal electrode, is different from a second distance, in a direction parallel to the insulating substrate, between a connection point on the second end face between an outer end of the third planar coil pattern and the third external terminal electrode and a connection point on the second end face between an outer end of the fourth planar coil pattern and the fourth external terminal electrode. [Appendix 2] 2. The coil component according to claim 1, wherein the second distance at the second end face is shorter than the first distance at the first end face. [Appendix 3] 2. The coil component according to claim 1, wherein the second distance at the second end face is longer than the first distance at the first end face. [Appendix 4] A coil component according to any one of appendices 1 to 3, wherein, when viewed in the thickness direction of the insulating substrate, the first through conductor of the first coil section and the second through conductor of the second coil section are arranged on either side of the magnetic core. [Appendix 5] A coil component described in any one of appendixes 1 to 3, wherein the first through conductor of the first coil portion and the second through conductor of the second coil portion are adjacent to each other when viewed in the thickness direction of the insulating substrate. [Appendix 6] 6. The coil component according to any one of appendices 1 to 5, wherein at least one of outer ends of the first planar coil pattern, the second planar coil pattern, the third planar coil pattern, and the fourth planar coil pattern is duplicated by a pair of electrodes that overlap with each other via the insulating substrate and are connected by a through conductor provided in the insulating substrate. [Appendix 7] 7. The coil component according to claim 6, wherein the paired electrodes are offset in a direction parallel to the insulating substrate with respect to the outer end portions. [Appendix 8] the element body has a rectangular shape when viewed in the thickness direction of the insulating substrate, 8. The coil component according to claim 1, wherein the first end face and the second end face correspond to a pair of short sides of the rectangle, respectively. [Explanation of symbols]

[0051] 10...coil component, 12...main body portion, 14A to 14D...external terminal electrodes, 20...insulating substrate, 22A to 22D...planar coil pattern, 22a...outer end portion, 22b...inner end portion, 22c...winding portion, 26, 27...through conductor, 30...magnetic body, C...coil, C1...first coil portion, C2...second coil portion, D1, D2...distance, L...equidistance line, P1 to P4...connection points.

Claims

1. an element body having a first end face and a second end face parallel to each other; an insulating substrate provided within the element body, perpendicular to the first end face and the second end face, and extending between the first end face and the second end face; a first coil portion including: a first planar coil pattern provided on one surface of the insulating substrate, wound around a magnetic core perpendicular to the insulating substrate, and having an inner end and an outer end extending to the first end surface of the element body; a second planar coil pattern provided on the other surface of the insulating substrate, having an inner end overlapping the inner end of the first planar coil pattern when viewed in a thickness direction of the insulating substrate and an outer end extending to the first end surface of the element body; and a first through conductor penetrating the insulating substrate in the thickness direction and connecting the inner end of the first planar coil pattern to the inner end of the second planar coil pattern; a third planar coil pattern wound on the one surface of the insulating substrate in parallel with the first planar coil pattern, and having an inner end and an outer end extending to the second end surface of the element body; a fourth planar coil pattern formed on the other surface of the insulating substrate, and having an inner end overlapping the inner end of the third planar coil pattern when viewed in a thickness direction of the insulating substrate and an outer end extending to the second end surface of the element body; and a second through conductor penetrating the insulating substrate in a thickness direction and connecting the inner end of the third planar coil pattern to the inner end of the fourth planar coil pattern; a first external terminal electrode provided on the first end surface of the element body and connected to an outer end of the first planar coil pattern; a second external terminal electrode provided on the first end surface of the element body and connected to an outer end of the first planar coil pattern; a third external terminal electrode provided on the second end surface of the element body and connected to an outer end of the third planar coil pattern; and a fourth external terminal electrode provided on the second end surface of the element body and connected to an outer end of the fourth planar coil pattern. Equipped with an outer end of the first planar coil pattern exposed on the first end surface and an outer end of the third planar coil pattern exposed on the second end surface face each other in a facing direction between the first end surface and the second end surface, and an outer end of the second planar coil pattern exposed on the first end surface and an outer end of the fourth planar coil pattern exposed on the second end surface face each other in a facing direction between the first end surface and the second end surface, a first distance, in a direction parallel to the insulating substrate, between a connection point on the first end face between an outer end of the first planar coil pattern and the first external terminal electrode and a connection point on the second end face between an outer end of the second planar coil pattern and the second external terminal electrode, which is different from a second distance, in a direction parallel to the insulating substrate, between a connection point on the second end face between an outer end of the third planar coil pattern and the third external terminal electrode and a connection point on the second end face between an outer end of the fourth planar coil pattern and the fourth external terminal electrode.

2. The coil component according to claim 1 , wherein the second distance at the second end surface is shorter than the first distance at the first end surface.

3. The coil component according to claim 1 , wherein the second distance at the second end surface is longer than the first distance at the first end surface.

4. 2. The coil component according to claim 1, wherein, when viewed in the thickness direction of the insulating substrate, the first through conductor of the first coil portion and the second through conductor of the second coil portion are arranged on either side of the magnetic core.

5. 2. The coil component according to claim 1, wherein the first through conductor of the first coil portion and the second through conductor of the second coil portion are adjacent to each other when viewed in the thickness direction of the insulating substrate.

6. 2. The coil component according to claim 1, wherein at least one of outer ends of the first planar coil pattern, the second planar coil pattern, the third planar coil pattern, and the fourth planar coil pattern is duplicated by a pair of electrodes that overlap with each other via the insulating substrate and are connected by a through conductor provided in the insulating substrate.

7. The coil component according to claim 6 , wherein the paired electrodes are offset from the outer end portions in a direction parallel to the insulating substrate.

8. the element body has a rectangular shape when viewed in the thickness direction of the insulating substrate, The coil component according to claim 1 , wherein the first end face and the second end face correspond to a pair of short sides of the rectangle, respectively.

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